Die roll apparatus for internal gears

ABSTRACT

A floating mount for internal gears is provided which holds the gears against a die roll gear that smooths and chamfers the teeth. The die roll gear operates inside the internal gear which is pressed against it by one or more freely rotative pressure wheels engaging its exterior periphery and force feeding it against the die roll gear as the die roll gear is rotated by power means. An adjustable holding member is disposed against one radial face of the internal gear to limit axial movement and support it against axial stress while the other radial face is slidably supported on a surface encompassing the die roll gear.

United States Patent [191 Baukneclit et a1.

[ DIE ROLL APPARATUS FOR INTERNAL GEARS [75] Inventors: Otto Bauknecht;Adolf Horl, both of Friedrichshafen, Germany [73] Assignee:Zahnradfabrik Friedrichshafen Aktiengesellschatt, Friedrichshafen,Germany [22] Filed: Sept. 13, 1971 [21] Appl. No.: 180,004

[30] Foreign Application Priority Data Sept. 24, 1970 Germany P 20 47037.5

[52] U.S. Cl; 72/94, 72/105, 72/109 [51] Int. Cl. B21h 5/02 [58] Fieldof Search 72/94, 106, 110,

[56] References Cited UNITED STATES PATENTS 309,082 12/1884 Munton72/109 1 Oct. 16, 1973 Primary Examiner-Lowell A. LarsonAttorney-Zalkind, Home &'Shuster [57] ABSTRACT A floating mount forinternal gears is provided which holds the gears against a die roll gearthat smooths and chamfers the teeth. The die roll gear operates insidethe internal gear which is pressed against it by one or more freelyrotative pressure wheels engaging its exterior periphery and forcefeeding it against the die roll gear as the die roll gear is rotated bypower means. An adjustable holding member is disposed against one radialface of the internal gear to limit axial movement and support it againstaxial stress while the other radial face is slidably supported on asurface encompassing the die roll gear.

8 Claims, 4 Drawing Figures PATENTEDUCT 1 5197s INVENTORS Otto Bauknech'Adolf Hb'rl ATTORNEY Z/AXAQWMM 1 DIE ROLL APPARATUS FOR INTERNAL GEARSThe invention is an improvement on the previously filed patent copendingapplication of the same assignee, invented by Bauknecht et al., Ser. No.141,708, filed May 10, 1971 for Apparatus and Method Finishing GearTeeth. In the previously filed application there is described anapparatus and method of smoothing the flanks of external gear teeth andchamfering the corners, in which a die roll gear, Le, a tool gear ispower rotated in engagement with a spur gear, i.e., a work gear, and aroller means for effecting pressure on the tool gear is utilized forprogressively increasing feed engagement by a hydraulic power apparatusas the gears roll in engagement with each other. Various modificationsare shown in the prior application, but essentially the die roll gear ispower rotated and is wider across the tooth flank than the work gear.The die roll gear is made up of a central guide gear to which chamferinggears are fastened on either side. The previous application is relied onto show details not shown in the present application.

The present invention relates to the finishing that is smoothing,deburring and chamfering of internal gears which present problems notpresent in performing such an operation on externally toothed gears.

Such problems have been solved in a novel and simple manner in thepresent instance by providing a mount for the work gear comprising asurface on which a radial face of the work gear rests and can slideradially.into progressive tooth engagement with a die roll gear rotatedby power and disposed inside the work gear. A holder member isadjustable so as to be engageable with the opposite radial face of thework gear in order to prevent axial displacement. By providing a feedpressure against the periphery of the work gear via one or more pressurefeed rollers, progressive tooth engagement is effected.

A detailed description of the invention now follows in conjunction withthe appended drawing in which:

FIG. 1 illustrates in elevational partial cross-section the essentialelements of an apparatus for carrying out the invention utilizing asingle pressure roller;

FIG. 1(a) shows an adjusting device which may be of any conventionalnature but which controls the positioning of a work gear.

FIG. 2 shows a modified arrangement using a pair of pressure rollers;and

FIG. 3 is a view essentially as shown in FIG. 1 except that the die rollgear is a single integral tool gear.

Referring now to FIG. 1, the apparatus comprises a base 7 carrying apower rotated shaft 4 having a chuck 6 for holding a composite die rollgear comprised of guide gear 1 flanked by chamfer gears 2 and 3 securedas an integral unit, all as heretofore described in the previously filedapplication.

The guide roll gear extends upwardly from the chuck which presents a topbearing surface for sliding support of an internal work gear 10.

The lower radial face of the work gear thus rests on the chuck, or forthat matter, on any other suitably rigid surface while the upper radialsurface of the work gear is engageable by a holder member 16 in the formof a cylindrical cup and which is vertically and horizontally adjustableas by any suitable adjusting means K which may be of completelyconventional construction.

The adjustment is such that sliding clearance between the bottom edge ofmember 16 and the upper face of the work gear is provided so as not tocause any clamping of the work gear. However, the presence of the member16 will prevent any axial displacement of the work gear to anysignificant degree and will support axial stresses in order to insureproper engagement with the chamfering rolls and symmetrical chamfering.

A large pressure feed roller 12 is mounted freely rotative on a slide 5and disposed to bear on the outer surface 11 of work gear 10 at a pointwhich will be understood to effect a radial pressure against the engagedteeth of the tool or die roll gear and the work gear. From a geometricstandpoint, the point of tangency of pressure roller 12 with the workgear would be in a radial plane with the engaging teeth at the point ofgreatest engagement, as will be apparent to persons skilled in themachine design arts.

The pressure roller 12 is journaled to be freely rotated on the slide 5as the roller bears against the work gear rotated by the tool gear.Slide 5 is guided in tracks 9 on base plate 7. The slide is powerreciprocated by piston rod 17 of hydraulic motor piston 8 in a wellknown manner and in a general construction as described in thepreviously filed application.

Thus, as the die roll gear is power rotated by means of shaft 4, theroller 12 bears against the work gear periphery to progressivelyincrease engagement in order to produce a fully finished smoothing andchamfering operation. The work gear is thus seen as being slidablycarried, i.e., having a floating mount but restrained from moving in anydirection except that required for the finishing operation.

Any conventional bi-planar adjustable mechanism K may be used which willbe understood to be fixed to ground or to the base plate 7 andadjustments may be made during the course of an operation as necessaryby simple hand screws or the like.

Referring now to FIG. 2, the previous arrangement is modified only tothe extent of providing a pair of rollers 14 and 15 carried by a yoke 13and disposed at equal angles with respect to the radial plane thatbisects the angle of tooth engagement. Yoke 13 is reversibly movable asby the hydraulic system described in FIG. 1 and as indicated by thedouble headed arrow in FIG. 2.

FIG. 3 is a section similar to FIG. 1, the difference being that the dieroll gear 1A is made of a single integral gear rather than by acomposite gear as described in FIG. 1, to engage work gear 10A andhaving greater width so as to extend at both sides as shown.

We claim:

1. A die roll apparatus for finishing internal gear teeth comprising apower rotated chuck for a die roll gear and a support member forslidably supporting the radial face of an internal gear in mesh with adie roll gear disposed internally of said internal gear and rotated bysaid chuck;

pressure roller means disposed to engage the exterior of the saidinternal gear to feed said gear in sliding movement on said supportmember into said die roll gear while said die roll gear is rotating;

and means disposed to be engageable with the opposite radial face ofsaid internal gear to limit axial displacement thereof while sliding onsaid support member and being worked by said die roll gear.

2. A die roll apparatus as set forth in claim 1, including a die rollgear comprising a guide gear and chamfering gears secured to the sidesthereof, the composite being wider than an internal gear to be worked.

3. A die roll apparatus as set forth in claim 1, including a die rollhaving a tooth width greater than that of an internal gear to be workedthereby.

4. A die roll apparatus as set forth in claim 1, said pressure rollermeans comprising a rotatively mounted pressure roller disposed to exertpressure against said internal gear exteriorly thereof and meanscarrying said roller to exert tooth engaging force on said internal gearto effect working of the teeth thereof by said die roll gear.

5. A die roll apparatus as set forth in claim 1, and said pressureroller means comprising a pair of spaced rollers disposed to exertpressure against said internal gear exteriorly thereof and meanscarrying said rollers to exert tooth engaging force on said internalgear to effect working of the teeth thereof by said die roll gear.

6. A die roll apparatus as set forth in claim 1, said pressure rollermeans being disposed to exert radial force on said work gear at equalangles to a plane bisecting the angle of tooth engagement of said workgear and said die roll gear.

7. A die roll apparatus as set forth in claim 1, said means disposed tobe engageable with the opposite radial face of said internal gear tolimit axial displacement comprising a member having a surface engageablewith said opposite radial face of said internal gear and adjusting meansto locate said member surface relative to said gear face with clearanceto permit sliding of said internal gear while being worked.

8. A die roll apparatus as set forth in claim 1, and said pressureroller means comprising at least one freely rotative pressure rollerdisposed to exert tooth engaging force against said internal gearexteriorly thereof; and reciprocal means carrying said roller to exertsaid tooth engaging force by progressive linear movement.

* II i

1. A die roll apparatus for finishing internal gear teeth comprising apower rotated chuck for a die roll gear and a support member forslidably supporting the radial face of an internal gear in mesh with adie roll gear disposed internally of said internal gear and rotated bysaid chuck; pressure roller means disposed to engage the exterior of thesaid internal gear to feed said gear in sliding movement on said supportmember into said die roll gear while said die roll gear is rotating; andmeans disposed to be engageable with the opposite radial face of saidinternal gear to limit axial displacement thereof while sliding on saidsupport member and being worked by said die roll gear.
 2. A die rollapparatus as set forth in claim 1, including a die roll gear comprisinga guide gear and chamfering gears secured to the sides thereof, thecomposite being wider than an internal gear to be worked.
 3. A die rollapparatus as set forth in claim 1, including a die roll having a toothwidth greater than that of an internal gear to be worked thereby.
 4. Adie roll apparatus as set forth in claim 1, said pressure roller meanscomprising a rotatively mounted pressure roller disposed to exertpressure against said internal gear exteriorly thereof and meanscarrying said roller to exert tooth engaging force on said internal gearto effect working of the teeth thereof by said die roll gear.
 5. A dieroll apparatus as set forth in claim 1, and said pressure roller meanscomprising a pair of spaced rollers disposed to exert pressure againstsaid internal gear exteriorly thereof and means carrying said rollers toexert tooth engaging force on said internal gear to effect working ofthe teeth thereof by said die roll gear.
 6. A die roll apparatus as setforth in claim 1, said pressure roller means being disposed to exertradial force on said work gear at equal angles to a plane bisecting theangle of tooth engagement of said work gear and said die roll gear.
 7. Adie roll apparatus as set forth in claim 1, said means disposed to beengageable with the opposite radial face of said internal gear to limitaxial displacement comprising a member having a surface engageable withsaid opposite radial face of said internal gear and adjusting means tolocate said member surface relative to said gear face with clearance topermit sliding of said internal gear while being worked.
 8. A die rollapparatus as set forth in claim 1, and said pressure roller meanscomprising at least one freely rotative pressure roller disposed toexert tooth engaging force against said internal gear exteriorlythereof; and reciprocal means carrying said roller to exert said toothengaging force by progressive linear movement.